38 



There are six plates in the azygous area. The first is elon- 

 gated, pentagonal, rests between the . superior sloping sides of 

 two subradials and the inferior sloping side of the first pri- 

 mary radial on the right. The second truncates a subradial 

 adjoins the two primary radials on the left, and the first and 

 third on the right and supports the fourth above. It is a small 

 hexagonal plate. The third is heptagonal and about the size 

 of the second. The fourth and fifth plates rest on the second 

 and third and are about the same size. The sixth plate is the 

 largest plate in the area, triangular, and extends its superior 

 angle to the lower side of the third tertiary radials. 



This species is distinguished by its general form, by the 

 number and structure of its thirty eight arms and by the six 

 plates in the azygous area. 



Pound by Prof. A. G. Wetherby, in the Kaskaskia Group, in 

 Pulaski county, Kentucky, and now in the collection of Win. 

 P. E. Gurley. 



BARYCRINUS ELROD1, n. Sp. 



Plate II, Fig. 25, azygous view; Fig. 26, basal view; Fig. 27, 

 view opposite the azygous area. 



Species large and plates remarkably thick. Calyx rapidly 

 expanded, broadly bowl-shaped, one-half wider than high. 

 Plates very tumid and radiately sculptured so as to leave an 

 angular ridge directed to the middle of the side of each abut- 

 ting plate. 



Basals form a low expanding cup. The column is large and 

 covers the bottom of the basal cup. The columnar canal is 

 very large and pentalobate. A furrow arises at the summit of 

 each first primary radial and descending slowly widens and 

 deepens to the lower surface of the basal cup. Subradials 

 large nearly as long as wide, radiately furrowed toward each 

 angle and toward the middle of the basal plates, so as to leave 

 two angular ridges extending to the basal plate below and one 

 to the middle of each side of the adjacent plates. First radial 

 the largest plates in the calyx, wider than high. Two rounded 

 ridges arise at the lower edge of the facet for the second ra- 

 dials on each plate and extend to the middle of the adjacent 

 sides of the subradials. The plates are arcuately depressed 

 laterally so as to leave the lateral sutures at the bottom of the 

 furrow or concavity. There is a broad, concave facet, extend- 

 ing nearly the entire width of each plate and depressed out- 



